论文部分内容阅读
1.引言 最初人们认为复合材料对疲劳载荷不敏感,因为它们在拉一拉载荷下对应干10~7次循环的疲劳强度与静强度十分接近,显示了极其优越的抗疲劳性能。但进一步的研究却发现,与一般的金属材料不同,复合材料对以压为主的疲劳载荷比较敏感,在这些载荷下的寿命明显地低于拉-拉疲劳载荷下的寿命。因此,复合材料的疲劳问题重新受到了注意,而且对它的研究也主要集中在压缩载荷的范围内。尽管已投入了大量的人力,但由于复合材料
1. INTRODUCTION Initially, composites were considered insensitive to fatigue loading since they exhibited very close fatigue strength to static strength for 10 to 7 cycles under pull-pull load and showed extremely superior fatigue properties. However, further studies have found that, unlike conventional metal materials, composite materials are more sensitive to compression-based fatigue loads and have significantly lower lifetimes under these loads than tensile-pull fatigue loads. Therefore, the fatigue problem of composite material has been paid attention again, and its research is mainly concentrated in the range of compressive load. Despite having invested a lot of manpower, but due to the composite material